Added note form field

This adds a form field which you can use in the xml files for extensions.
This form field makes it possible (and easy) to create titles, texts, descriptions and even alert boxes.

This makes it very easy to bring order in the settings for extensions, by separating them with useful titles. Or adding descriptions for certain settings (without having to rely on the tooltips). Or adding any other text you want.

The syntax is pretty straight-forward:
```<field name="..." type="note" label="..." description="..." class="..." close="..." />```

So just to go through the parameters:
* **name**: contains the name of the field (like with any other field tag)
* **type**:
* **type**: